Add progressive web app companion for cross-platform access

Vite + TypeScript PWA that mirrors the Android app's core features:
- Pre-processed shelter data (build-time UTM33N→WGS84 conversion)
- Leaflet map with shelter markers, user location, and offline tiles
- Canvas compass arrow (ported from DirectionArrowView.kt)
- IndexedDB shelter cache with 7-day staleness check
- Service worker with CacheFirst tiles and precached app shell
- i18n for en, nb, nn (ported from Android strings.xml)
- iOS/Android compass handling with low-pass filter
- Respects user map interaction (no auto-snap on pan/zoom)
- Build revision cache-breaker for reliable SW updates

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

pwa/node_modules/@babel/plugin-bugfix-v8-spread-parameters-in-optional-chaining/lib/index.js

@@ -0,0 +1,66 @@
+'use strict';
+
+Object.defineProperty(exports, '__esModule', { value: true });
+
+var helperPluginUtils = require('@babel/helper-plugin-utils');
+var pluginTransformOptionalChaining = require('@babel/plugin-transform-optional-chaining');
+var helperSkipTransparentExpressionWrappers = require('@babel/helper-skip-transparent-expression-wrappers');
+var core = require('@babel/core');
+
+function matchAffectedArguments(argumentNodes) {
+  const spreadIndex = argumentNodes.findIndex(node => core.types.isSpreadElement(node));
+  return spreadIndex >= 0 && spreadIndex !== argumentNodes.length - 1;
+}
+function shouldTransform(path) {
+  let optionalPath = path;
+  const chains = [];
+  for (;;) {
+    if (optionalPath.isOptionalMemberExpression()) {
+      chains.push(optionalPath.node);
+      optionalPath = helperSkipTransparentExpressionWrappers.skipTransparentExprWrappers(optionalPath.get("object"));
+    } else if (optionalPath.isOptionalCallExpression()) {
+      chains.push(optionalPath.node);
+      optionalPath = helperSkipTransparentExpressionWrappers.skipTransparentExprWrappers(optionalPath.get("callee"));
+    } else {
+      break;
+    }
+  }
+  for (let i = 0; i < chains.length; i++) {
+    const node = chains[i];
+    if (core.types.isOptionalCallExpression(node) && matchAffectedArguments(node.arguments)) {
+      if (node.optional) {
+        return true;
+      }
+      const callee = chains[i + 1];
+      if (core.types.isOptionalMemberExpression(callee, {
+        optional: true
+      })) {
+        return true;
+      }
+    }
+  }
+  return false;
+}
+
+var index = helperPluginUtils.declare(api => {
+  var _api$assumption, _api$assumption2;
+  api.assertVersion(7);
+  const noDocumentAll = (_api$assumption = api.assumption("noDocumentAll")) != null ? _api$assumption : false;
+  const pureGetters = (_api$assumption2 = api.assumption("pureGetters")) != null ? _api$assumption2 : false;
+  return {
+    name: "bugfix-v8-spread-parameters-in-optional-chaining",
+    visitor: {
+      "OptionalCallExpression|OptionalMemberExpression"(path) {
+        if (shouldTransform(path)) {
+          pluginTransformOptionalChaining.transform(path, {
+            noDocumentAll,
+            pureGetters
+          });
+        }
+      }
+    }
+  };
+});
+
+exports.default = index;
+//# sourceMappingURL=index.js.map